update release-slackbot.yml

.github/workflows/release-slackbot.yml

@@ -51,5 +51,5 @@ jobs:
       with:
         username: wsmoogle
         password: ${{ secrets.DOCKER_REGISTRY_PASSWORD }}
-        repository: weseek/growi-slackbot
+        repository: weseek/growi-slackbot-proxy
         readme-filepath: ./docker/README.md